Vacuum cleaning device



Dec. ll, 1934. c. KUHNEL VACUUM CLEANING DEVICE Filed Jan. 6, 1934 Jill lil

Patented Dec. 11, 1934 UNITED STATES VACUUM CLEANnvG DEVICE Carl .KhneL Berlin-Gharlottenburg, Germany,

assigner to Siemens-Schuckertwerke Aktiengesellschaft, .Berlin-Siemensstadt,

Germany, a

corporation oi' Germany Application January 6;

1934, Serial No. 705,522

In Germany .November 29, 1932 1 Claim.

My invention relates to vacuum cleaning devices, and more particularly to a rotary brush for floor polishing, cleaning and theplike.

The devices of the above-indicated character hitherto employed are usually driven by the electric motor mounted inside the vacuum cleaner or if this is not possible by a particular motor which is secured to the suction 'nozzle carrying the brush. Such devices have, however, the drawback that they can only be employed for -such vacuum cleaners in which the suction nozzles are directly secured to the vacuum cleaner casing containing the motor or that they require a particular lead for the motor mounted on the suction cleaner, which must be arranged in such a complicated manner that it is liable to be injured to such an extent as to cause a voltage to be set upv in the casing of the apparatus. My invention has for its object to overcome the foregoing drawbacks and to provide an economical cleaning brush of simple construction which may be employed at the same time as auxiliary device for any type of vacuum cleaner.

To this end, the brush is arranged according to the invention in the nozzle of a vacuum cleaner in sucha manner and so designed that the brush is caused to be rotated as a turbine wheel by the current vof air produced by the vacuum cleaner. This is accomplished in the case of cylindrical brushes by arranging between the rows of brushes mounted on` the cylinder air-tight blades consisting preferably of a soft elastic material. The volume of air drawn in by the vacuum cleaner suiiicesthen to rotate the brush cylinder at such a rate that a satisfactory brushing eiect is at'- tained. Furthermore, such a device presents the advantage that the whirl of dust caused by the brush is drawn into the vacuum .cleaner by its suction action. Further, such a device is of such small dimensions and of such light weight that it may behandled by the operator for a considerable time without causing any fatigue. Besides, the neck of the nozzle, to which the ilexible tube of the vacuum cleaner is secured is preferably arranged on the casing of the suction nozale somewhat tangentially to the direction of rotation of the cylinder. In this manner the torque for the drive of the rcylinder is materially in creased. Furthermore, the-shaft of the cylindrical. brush. is preferably arranged in the suction nozzle so excentrically with respect to the walls thereof that ,the distance from the shaft of the cylindrical brush to the one inner wall along w ch thecurrent of air ows is greater than the distanceto the other inner wall. In this case a rotation of the cylindrical brush is also brought about evenif the device is so pressed against the oor that only a small amount of air be drawn in by the vacuum cleaner. The difference of `pressure between the atmospheric pressure and inside pressure is in this case suiiicient to cause the cylindrical brush to rotate. My invention is illustrated in the accompanying drawing in which- Fig. l represents in sectional side elevation one form of my invention;

Fig. 2 represents a front elevation of Fig. l, the front wall being partly broken away; and

Fig. 3 represents a horizontal section through the center ofthe cylinder 3 in Fig. 1.

, Referring to Figs.\1 to 3, 1 denotes thevcasing of the device designed in the form of a nozzle having a neck 2, to which a flexible hose or a suction tube of a vacuum cleaner may be secured.

In the lower part of the casing 1 which has the form` of a horizontally disposed cylinder, is-

` through the device and causes the cylindrical n brush 3 to rotate in the direction of the arrow 7. Since the distance of the cylindrical brush is greater :from the left-hand wall of the casingl than from the right-hand wall, the distance from thewall being such that the brushes contact at every point therewith, the brushes on passing over the right-hand inner wall must be be'nt back opposite to the direction of rotation. -The friction caused thereby is, however, very small so that the cylindrical brush 3 is not materially braked. i

I claim as my invention:

A vacuum-operated' polishing brush'for polishing surfaces, comprising a cylindrical casing having means for connecting it to a suction tube, and having an opening in its peripheral' wall facing andie'xtending substantially parallel with the surface to be polished, a cylindrical brush rotatably mounted in Qsaid casing eccentric :'ally` of the casing axis, andghaving a plurality of `rows of radially extenditg bristles sufclently long to CARL.

"always remain in contact with the casing wall, 

